Self-dumping hoist.



J. R. WALKER.

SELF DUMPING HOIST.

APPLICATION FILED JULY 18. I913.

1,2042 1 6. Pdtented. Nov. 7. 1916.

WITNESSES INVENTOR J' JAMES R,WALKR BYHIISRTTORNEZ' nnrrnn @llAd ATENT @FlFlQE.

JAMES R. WALKER, OF NIAGARA FALLS, NEV] YORK, ASSIGNOR TO NIAGARA ALKALI COMPANY, OF NIAGARA FALLS, NEW YORK, A CORPORATION OF NEVV YORK.

SELF-DUMPING HOIS'I.

Specification of Letters latent.

Patented Nov. 7, 191.6.

To all whom it may concern:

Be it known that I, JAMEs R. WALKER, a citizen of the United States, residing in Niagara Falls, New York, have invented certain Improvements in Self-Dumping Hoists, of which the following is a specification.

My invention relates to that type of hoisting apparatus in which the hoisting bucket automatically dumps its load when it reaches the limit of its lift, the object of my invention being to provide simple and efficient means for effecting such automatic dumping of the bucket and means for automatically arresting the lifting movement of the hoist as soon as the bucket has been dumped. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawing, in which- Figure 1 is a view representing, in diagrammatic form, the essential features of the apparatus constituting my invention, the

full lines showing the bucket in the position assumed by it while it is being hoisted and the dotted lines the position assumed by it when starting to dump its load, and Fi 2 is a similar view illustrating the bucket in position to complete the dumping of the load.

In the drawing, 1 represents the hoisting bucket which has, on each side, two projecting lugs or anti-friction rollers 2 and 3 vertically separated from one another to the extent required for the proper operation of the bucket, as hereinafter set forth. The projections on each side of the bucket are guided in a grooved guideway at vertical throughout the greater portion of its length but forked at the upper end so as to present upper and lower limbs 5 and 6 projecting forwardly from the guideway 1 at different angles in respect to the horizontal but uniting where they join the guideway a, as shown in Figs. 1 and 2.

The hoisting rope 7 is connected to the bucket at a point in the rear of a vertical line passing through the projections 52 and 3, so that when power is applied to the rope to lift the bucket the tendency of the latter will be to tilt forwardly and thus cause the upper projections 2 to bear against the front flanges S of the grooved guideways 4; and the lower projections 3 to bear against the rear flanges 9 of the same. When, therefore, the bucket reaches the forked upper end of the guideway rthe tendency of each upper projection will be to follow the forwardly curved front flange 8 of its guideway until it enters the lower limb (5 of the fork, as shown by dotted lines in Fig. 1, and then to follow said limb until it finally strikes a spring buffer 10 at the front end of the same, as shown in Fig. 2.

The tendency of each lower projection 23 on the bucket is to remain in contact with the rear flange 9 of its guideway, as shown by dotted lines in Fig. 1, until it finally enters the upper limb 5 of said guideway, said projection then following said upper limb in its further progress until it finally strikes a spring buffer 1.1. at the front end of the limb, as shown in 2. The effect of this action is to automatically dump the bucket,

as shown in Fig. 2, and when the strain on the hoisting rope is released the direction of movement of the projections 2 and 3 is reversed, and in its descent the bucket automatically assumes the upright position shown in Fig. 1.

Any desired form of hoisting mechanism may be employed for actuating the rope 7, but I prefer to use an electrical hoist whose operation and whose direction of rotation can be controlled by an appropriate switching device, and to cause the bucket, as it is dumped, to automatically actuate said switching device so as to arrest the opera tion of the hoisting mechanism.

As shown in Fig. 1, 12 represents the hoisting drum, 3 an electric motor for operating the same, and 14; a double pole switch for governing the flow of current to said motor. The arms of said double pole switch connected by a link 15 to one arm 16 of a bell crank lever whose other arm 17 projects into the path of the upper edge of the tilting bucket so as to be struck and moved thereby when the bucket has completed its tilt, as shown in Fig. 2.

When the parts are in the position shown in Fig. 1 the motor 13 is rotating in the direction necessary to operate the drum 12 so as to wind up the hoisting rope thereon. .Vhen, however, the hoisting and dumping of the bucket has been completed and the lever arm 17 has been moved by said bucket the switch arms will be adjusted to the positi on shown in Fig. 2 so as to open the switch and prevent further flow of current to the motor 13, whereupon the hoisting operation will be arrested.

In order to unwind the hoisting rope from the drum 12 so as to lower the bucket the arms of the switch 14- are moved to the reverse position by lowering a rod 18 connected to the end of the lever arm 16, and

- 'essary, the switch being closed by the rod 18 in order to start the motor and being opened by the automatic means described in order to stop the motor.

I claim: r

The 'comblnation, in a dumping hoist, of a bucket having guiding pro ect1ons one Copies of this patent may be obtained for five cents each, by addressing the Commissionerof' Patents,

jections after the latter enter the forward curve at the top of the guideway, whereby the upper projection will be directed into the lower limb ofthe' fork at the forward end of said curve and the lower projection into the upper limb of said fork. V

In testimony whereof, I have signed my name to this specification, 'inthe presence of two subscribing witnesses. V

JAMES R. WALKER.

lVitnesses: V

I-I; IJI VHITNEY, 7

Josnrn 'C. LANGLEY.

Washington, D. 0. v to V 

